Try giving him about a tbl spoon or so of mineral oil as a laxitive. Increase his temperature as he may not be digesting his food properly due to improper heating. Even if this means putting him in a smaller cage with plastic sheeting over it to hold in heat and humidity, for a short time. Get him healthy and get a vet check for parasites if he has lost any weight.

This link is the diet I used for all my igs.
Link

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